Title: Inappropriate TCP Resets Considered Harmful
Author(s): S. Floyd.
Status: BEST CURRENT PRACTICE
Date: Aug 2002
Length: 46748
This document is being written because there are a number of firewalls in the Internet that inappropriately reset a TCP connection upon receiving certain TCP SYN packets, in particular, packets with flags set in the Reserved field of the TCP header. In this document we argue that this practice is not conformant with TCP standards, and is an inappropriate overloading of the semantics of the TCP reset. We also consider the longer-term consequences of this and similar actions as obstacles to the evolution of the Internet infrastructure.
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